题目内容

过度学习达到_________%时,记忆保持效果最佳。

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In a three-disk volume group, a disk was physically removed from the system without performing any software procedures to properly remove the disk. Which of the following commands should be performed to recover from this error?()

A. extendvg
B. cfgmgr
C. reducevg
D. varyoffvg

投影技法是一种()的调查方法。

A. 无结构、非直接
B. 有结构、直接
C. 无结构、直接
D. 有结构、非直接

城市的概念有哪些标准。

磷肥在农业生产中起什么作用?

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